rust
use std::ptr;
use libc::malloc;
use libc::realloc;
use std::mem;

type ArrayListValue = i32; // Placeholder type, replace with the actual type needed

pub struct ArrayList {
    _alloced: usize,
    length: usize,
    data: *mut ArrayListValue,
}

impl ArrayList {
    pub fn new(initial_length: usize) -> Option<Self> {
        let len = if initial_length > 0 { initial_length } else { 16 };
        let data = unsafe { malloc(len * mem::size_of::<ArrayListValue>()) as *mut ArrayListValue };
        if data.is_null() {
            return None;
        }
        Some(ArrayList {
            _alloced: len,
            length: 0,
            data,
        })
    }

    fn free(&mut self) {
        unsafe {
            ptr::free(self.data as *mut _);
            self.data = std::ptr::null_mut(); // Prevent dangling pointer after free
        }
    }

    fn increase_capacity(&mut self) -> bool {
        let new_size = self._alloced * 2;
        let new_data = unsafe { realloc(self.data as *mut _, new_size * mem::size_of::<ArrayListValue>()) as *mut ArrayListValue };
        if new_data.is_null() {
            return false;
        }
        self.data = new_data;
        self._alloced = new_size;
        true
    }

    pub fn insert(&mut self, index: usize, value: ArrayListValue) -> bool {
        if index > self.length {
            return false;
        }
        if self.length == self._alloced {
            self.increase_capacity();
        }
        unsafe {
            ptr::copy_nonoverlapping(self.data.add(index), self.data.add(index + 1), (self.length - index) * mem::size_of::<ArrayListValue>());
            *self.data.add(index) = value;
        }
        self.length += 1;
        true
    }

    pub fn append(&mut self, value: ArrayListValue) {
        self.insert(self.length, value);
    }

    pub fn prepend(&mut self, value: ArrayListValue) {
        self.insert(0, value);
    }

    pub fn remove_range(&mut self, index: usize, length: usize) {
        if index + length > self.length {
            return;
        }
        unsafe {
            ptr::copy_nonoverlapping(self.data.add(index + length), self.data.add(index), (self.length - (index + length)) * mem::size_of::<ArrayListValue>());
        }
        self.length -= length;
    }

    pub fn remove(&mut self, index: usize) {
        self.remove_range(index, 1);
    }

    pub fn index_of<F>(&self, mut callback: F, value: &ArrayListValue) -> Option<usize>
    where
        F: FnMut(&ArrayListValue) -> bool,
    {
        let data_slice = unsafe { std::slice::from_raw_parts(self.data, self.length) };
        for (i, &item) in data_slice.iter().enumerate() {
            if callback(&item) {
                return Some(i);
            }
        }
        None
    }

    pub fn clear(&mut self) {
        self.length = 0;
    }
}

impl Drop for ArrayList {
    fn drop(&mut self) {
        self.free();
    }
}

fn main() {
    let mut list = ArrayList::new(0).expect("Failed to create ArrayList");
    list.append(10);
    list.prepend(20);
    // ... use the list as needed ...
}

